Before the outbreak of World War II, American capital did provide Nazi Germany with a lot of capital and technology.
from p>1924 to 1933, the total amount of loans flowing into Germany through the international consortia on Wall Street was 33 billion marks, of which the largest three sums were used to establish and help three large industrial cartels (a form of monopoly) respectively. These three cartels are German General Electric Power (A.E.G), United Steel, and I.G. Faben, which respectively control the electric power, steel and chemical industries and grasp the industrial lifeline of Germany. By 1937, the explosives produced by United Steel and IG France accounted for 95% of the national total, and the famous Krupp Arms Company was also under their control. This not only benefits from American loans, but also American technology.
Wall Street also supported Hitler's campaign through the German oligarchy enterprises it controlled. After Hitler came to power, in August 1933, the American Banking Association negotiated with Germany on the loan issue. The Bank of America agreed to delay the repayment of the previous loans by Germany, and ensured that all the income of American capital and industry in Germany would be used only in Germany in the future, so as to build new military enterprises or rebuild the original military enterprises.
From 1933 to 1939, during the six years when Germany was preparing for the Second World War, DuPont Consortium, chemical companies, Rockefeller Financial Group and Mobil oil companies, Morgan Consortium and its controlled telegraph and telephone company, and Ford Motor Company (Henry Ford himself won the Cross Eagle Medal for his cooperation with the Nazis) rushed to sign huge orders for strategic raw materials and military projects with Germany. Aircraft alone, in the eight months of 1934, the number of American exports to Germany increased by more than five times compared with 1933. Between 33 and 39 years, more than 6 American companies operated in the military institutions of Nazi Germany.
There is no ambiguity in technology export trade. Dupont sold the technology of chloroprene rubber and aircraft explosion-proof agent to Germany through the I.G. French version. The technology of tank lubricating oil is obtained from Mobil oil company; Hitler's important help in developing the air force came from a special gasoline factory for aircraft set up by Mobil in Germany; The telegraph and telephone company participated in the development of a new German aircraft. Later, during the war, even the American navy secretary admitted that the United States provided Hitler with the most advanced aircraft engines.